Answer:
c = (ef-ab)/d
Step-by-step explanation:
ab+cd = ef
Subtract ab from each side
ab+cd -ab = ef-ab
cd = ef-ab
Divide by d
cd /d =(ef-ab)/d
c = (ef-ab)/d
Treat 12 as 12/1 that means 12 divided into 1 part
1/4 times 12/1
multiply the top and the bottom becuase

times

=

so
1/4 times 12/1=(1 times 12)/(4 times 1)=12/4=3/1=3
the answe ris 3
It would be D. If you add all the numbers (-18, -81, 144) and divide it by 3 then you would get -81. I hope I helped!
45 black dogs because 2/3 of 60 is 45
35 Degrees. This is because the a straight line is 180 degrees. Knowing this, 180-100= 80. 80+65= 145. 180-145=35 which is the missing angle.